College of Electronic Science and Technology, Shenzhen University, THz Technical Research Center, Shenzhen University, Key Laboratory of Optoelectronics Devices, and Systems of Ministry of Education and Guangdong Province, Shenzhen University, Shenzhen, 518060, P. R. China.
Dalton Trans. 2018 Oct 2;47(38):13498-13506. doi: 10.1039/c8dt02548g.
In this study, we synthesized nanosized Sn-doped C12A7:e- (C12Al7-xSnx:e-, where x = 0.20 to 1) composite with high surface area of 244 m2 g-1. An increasing trend in conductivity of Sn-doped C12A7:e- composites was observed at 300 K: 24 S cm-1, 68 S cm-1, 190 S cm-1 and 290 S cm-1, at doping levels of x = 0.20, 0.40, 0.80, and 1, respectively. Sn-doped C12A7:e-, with and without reduced graphene oxide (rGO), acts as a less expensive and highly active and durable electrocatalyst in the oxygen reduction reaction (ORR) for fuel cells. In the case of C12A7-xSnx:e- (where x = 1), calculated onset potential and current density were comparable to the commercially available 20% Pt/C electrode. Moreover, significant improvement was observed for Sn-doped C12A7:e- (doping level x = 1) with rGO composite. The ORR current density was about 5.9 mA cm-2, which was higher than that of Pt/C (5.2 mA cm-2). Our investigation of the effect of cation doping on structural and electrical properties of Sn-doped C12A7:e- composites shows that these results manifested the feasibility of this sol-gel method for different element doping. Furthermore, the as-prepared promising non-noble metal catalysts (NNMCs), viz., Sn-doped C12A7:e- composite materials, possess intrinsic long-time stability and excellent methanol resistance toward ORR in alkaline media and may serve as a promising alternative to Pt/C materials for ORR in its widespread implementation in fuel cells.
在这项研究中，我们合成了具有高比表面积 244 m2 g-1 的纳米尺寸锡掺杂 C12A7:e-（C12Al7-xSnx:e-，其中 x = 0.20 至 1）复合材料。在 300 K 时，观察到锡掺杂 C12A7:e-复合材料的电导率呈上升趋势：掺杂水平为 x = 0.20、0.40、0.80 和 1 时，分别为 24 S cm-1、68 S cm-1、190 S cm-1 和 290 S cm-1。具有和不具有还原氧化石墨烯（rGO）的锡掺杂 C12A7:e-，在燃料电池的氧还原反应（ORR）中用作更便宜、高活性和高耐用的电催化剂。在 C12A7-xSnx:e-（其中 x = 1）的情况下，计算的起始电位和电流密度可与市售的 20%Pt/C 电极相媲美。此外，在 rGO 复合材料中，观察到锡掺杂 C12A7:e-（掺杂水平 x = 1）的显著改善。ORR 电流密度约为 5.9 mA cm-2，高于 Pt/C（5.2 mA cm-2）。我们对阳离子掺杂对锡掺杂 C12A7:e-复合材料结构和电学性能的影响的研究表明，这些结果表明了溶胶-凝胶法用于不同元素掺杂的可行性。此外，所制备的有前途的非贵金属催化剂（NNMCs），即锡掺杂 C12A7:e-复合材料，在碱性介质中具有内在的长时间稳定性和对 ORR 的优异甲醇耐受性，并且可能作为 Pt/C 材料的有前途的替代品，用于广泛应用于燃料电池中的 ORR。
